Investigation of the laminar-turbulent transition mechanisms of low pressure turbine boundary-layers with linear stability theory

The boundary layer transition is a crucial focus in aerospace engineering. This study conducts a thorough analysis of the transition from laminar to turbulent flow on a low-pressure turbine blade, utilizing two different approaches: Linear Stability Theory (LST) and Linear Parabolized Stability Equations (LPSE). By conducting simulations and comparing them with experimental data, this research investigates the differences and similarities between the two theories, with the goal of understanding the transition in the low-pressure turbine. The focus is on the dynamic characteristics of the boundary layer flow, the instability patterns, and the envelope of Tollmien-Schlichting (TS) waves on the turbine blade. The results demonstrate that both theories provide valid forecasts regarding boundary layer transition, but they significantly differ in their ability to resolve and predict instability mechanisms. This study enhances our comprehension of the mechanisms governing the transition in low-pressure turbines, thereby offering valuable insights for optimizing design and enhancing the performance of these crucial components.